С(квадрат)=А(квадрат)+В(квадрат)-2АВ*косинус60
C^2=6^2+8^2-2*6*8*cos60
C^2=36+64-96*1/2
C^2=36+64-48
C^2=100-48
C^2=52
C=корен 52
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С(квадрат)=А(квадрат)+В(квадрат)-2АВ*косинус60
C^2=6^2+8^2-2*6*8*cos60
C^2=36+64-96*1/2
C^2=36+64-48
C^2=100-48
C^2=52
C=корен 52